ABB, the Swiss power and automation technology group, said on Thursday that it had won a $62-million order from the South African utility Eskom to strengthen one of the region’s most important cross-border power transmission systems.
“ABB will refurbish the HVDC Apollo converter station near Johannesburg. Upon completion in May 2008, the refurbishment will improve the reliability of the converter station receiving electricity from Mozambique,” the company said in a statement.
“This refurbishment will significantly increase grid reliability and power flow in this key area,” said Samir Brikho, head of ABB’s Power Systems division.
“Using our semiconductor valves and control technology, we have already successfully upgraded a number of existing HVDC plants with minimal disruption.”
This HVDC system helps to integrate hydropower produced at the Cahora Bassa dam in Mozambique with the grid in South Africa, where electricity is mainly produced by coal-burning thermal power plants, the company noted.
The refurbished Apollo converter station, which was constructed in the 1970s, will boost the transmission reliability of the converter station. It will also prepare for future upgrades that may be required.
“ABB’s scope of supply includes new thyristor valves with a unique outdoor design that will minimise the interruption of supply from Cahora Bassa during the upgrade.
“The entire control and protection system will be replaced using ABB’s computerised Mach 2 system, and ABB will also supply new AC harmonic and DC
filters using DC capacitors,” the company explained.
Earlier this month, ABB won a $30-million contract from Eskom for equipment to help strengthen power grid reliability. It was the largest order for transmission circuit breakers received by ABB. – I-Net Bridge